Zero setting control means



Feb. 13, 1962 H. J. CHALL ETAL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 1 Filed Dec. 31, 1956 Feb. 13, 1962 H. .1. CHALL ETAL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 2 Filed D60. 31, 1956 mm-Hlmh mam E2 33 8% QR QR 23 83 as M22 xa fi gem 38 $8 8m N8 8a 22 :2 \mmnlv\ SR 82 2 82 as as $2 Feb. 13, 1962 H. JSVCHALL EI'AL 3,021,055

ZERO SETTING CONTROL MEANS Filed Dec. 31, 1956 24 Sheets-Sheet 3 PIE-*5 0 2 3 5 l I 2 3 5 2 l 2 5 OR I o 9 4 5 LTRS.| 2 4 5 FIGS l 2 4 5 STOP I 2 3 4 SPACE 3 Feb. 13, 1962 H. J. CHALL ETAL 3,021,055

ZERO SETTING CONTROL MEANS Filed Dec. 51, 1956 24 Sheets-Sheet 4 ilrlillll lllllllll-l l1] 4, :IIIIIIIIIIIIII mm 1 il; W llll Feb. 13, 1962 v H. J. CHALL EIAL 3,021,055

ZERO SETTING CONTROL MEANS Filed Dec. 51. 1956 24 Sheets-Sheet 5 Feb. 13, 1962 Filed Dec. 3;; 1956 H. J. CHALL EFAL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 6 Feb. 13, 1962 H. J. CHALL ETAL 3,021,055

ZERO SETTING CONTROL MEANS Filed Dec. 31, 1956 24 Sheets-Sheet 7 Feb. 13, 1962 H. J. CHALL ETAL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 8 Filed Dec. 31, 1956 m 'm-Hm Feb. 13, 1962 H. J. CHALL ETAL ZERO SETTING CONTROL MEANS Filed Dec. 31, 1956 24 Sheets-Sheet 9 FIE 11 Feb. 13, 1962 H. J. CHALL ErAL 3,021,055 I ZERO SETTING CONTROL MEANS Filed Dec. 31, 1956 24 Sheets-Sheet 1O JE'IIE lE Q g a o g R N R Feb. 13, 1962 H. J. CHALL EI'AL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 11 Filed Dec. 31, 1956 Ehv mg Feb. 13, 1962 c L ETAL 3,021,055

ZERO SETTING CONTROL MEANS Filed Dec. 51, 1956 24 Sheets-Sheet 12 Feb. 13, 1962 H. J. CHALL ETAL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 14 Filed Dec. 31, 1956 and i? .Em 5% mmot nmot

mmnYv OmOQ w v m N ZOEbm Ew -Nm+ COM Feb. 13, 1962 Filed Dec. 31, 1956 H. J. CHALL ETAL 3,021,055

ZERO smwmc CONTROL MEANS 24 Sheets-Sheet 15 Feb. 13, 1962 H. J. CHALL EI'AL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 16 Filed Dec. 51, 1956 Feb. 13, 1962 J, cHALL ETAL 3,021,055 ZERQ SETTING CONTROL MEANS Filed Dec. 31, 1956 24 Sheets-Sheet 17 FIE lE FIE FII3 :LE

ZERO SETTING CONTROL MEANS Filed Dec. 51, 1956 24 Sheets-Sheet 18 IEIIEI' EIII Feb 13 1962 H. J. C HALL ETAL ZERO SETTING CONTROL MEANS 24 Sheets-Sheet 20 Filed Dec. 31, 1956 

